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. 2021 Jul 16;18:12. doi: 10.1186/s12976-021-00144-z

Fig. 1.

Fig. 1

Epidemiological characteristics in a cluster of SARS-CoV-2 infections among university students in Kyoto, Japan. a Epidemic curve. Daily counts of confirmed cases are shown as a function of the day of report. The recognition of the cluster was notified on 29 March 2020. b Spatial propagation of the cluster. The three index cases were university students returning from travel in Europe. Four clusters were identified in Kyoto and secondary or additional cases were reported across the country